LTC1475CMS8#PBF

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	LTC1475
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 70°C (TA)
Synchronous Rectifier:	No
Frequency - Switching:	--
Current - Output:	750mA (Switch)
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	18V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Buck-Boost, SEPIC
Output Configuration:	Positive or Negative
Function:	Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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<h2>LTC1475CMS8#PBF Application Field and Working Principle</h2><h3>Introduction</h3>LTC1475CMS8#PBF, or Linear Technology Corporation’s Low Noise Micropower Step-Down DC/DC Regulator, is a high-performance, low-noise, current-mode DC/DC regulator. This device allows for small battery-powered applications with tight space constraints, offering ultra-low noise and very low quiescent power-down current for noise-sensitive applications such as cell phones, DVD players, and laptop computers. The device is housed in a space-saving 8-pin MSOP package, and includes a current-mode PWM controller, an adjustable 0.5A/1A peak switch, a 7-bit DAC, an on-board reference, and protection features such as over voltage and over current protection.<h3>Features</h3>The LTC1475CMS8#PBF provides a few noteworthy features. It offers a wide 7-bit operating range (Vout= +0.8V to +11V) with ±1.5% accuracy. Additionally, this model provides low output ripple and noise, up to 92% duty cycle for lower output voltage, 200 kHz 2bh switching frequency, and integrated converters for reduced fan-out capacitance. Additionally, it is powered by a fixed 12V battery or by a 2-12V input. A total quiescent current of 8.4µA guarantees ultra-low noise, resulting in a very low output voltage noise. This capability makes the LTC1475CMS8#PBF an ideal choice for noise-sensitive applications.<h3>Application Field</h3>Due to its low noise and improved power efficiency, the LTC1475CMS8#PBF is ideal for portable battery-powered applications. Its wide output range of 0.8V to 11V makes it suitable for low voltage applications such as DSPs and microprocessors. Another key feature of this model is its sleep mode capability, allowing very low power consumption even in situations when the output is not required. Additionally, it is suitable for automotive and industrial applications as it is designed with an on-board thermal protection feature to protect the chip from heat spikes.<h3>Working Principle</h3>The LTC1475CMS8#PBF is a current mode DC/DC regulator that employs Constant-On-Time (COT) control and thus it operates without current sensing. Its internal Current Mode PWM controller works in conjunction with an adjustable 0.5A/1A peak switch which is optimized to minimize switching losses. The PWM controller generates a constant-on-time frequency-dependent signal during the switch-on periods, and during the switch-off periods, the chip automatically decreases the output voltage to an adjustable set point below the battery voltage by generating a frequency-dependent signal. The DAC determines the output voltage, and the output voltage can be adjusted by changing the bias current of the DAC input. Additionally, the on-board reference ensures superior accuracy, even in cases when the battery voltage is not perfectly stable and has some variations with temperature or load.<h3>Conclusion</h3>The LTC1475CMS8#PBF low noise micropower step-down DC/DC regulator is a high-performance chip that is ideal for battery-powered applications that require a wide output voltage range, low quiescent energy consumption, and excellent noise performance. Its constant-on-time, frequency-dependent topology ensures fast transient responses and excellent power efficiency. Its low output ripple and noise, high current operation, adjustable DAC output and on-board thermal protection makes it an ideal choice for demanding applications.

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